Coating binder polymer and coatings
AssigneeRohm and Haas Company
InventorGary William Dombrowski
Life of this patent
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Abstract
A multi-stage aqueous emulsion polymer including a first polymer having a calculated Hansch parameter>2.0, the first polymer including 0.5-5 wt. % copolymerized acid monomer, based on the weight of the first polymer, and a second polymer including from zero to less that half the wt. % of acid monomer in the first polymer, based on the weight of the second polymer, the second polymer being from 50% to 85% of the total weight of the first polymer and the second polymer, wherein the difference between the calculated Tgs of the first and the second polymer is from 0° C. to less than 20° C. is provided. Also provided is an aqueous coating composition including the multi-stage emulsion polymer and a method for providing a coating.
Claims9
A multi-stage aqueous emulsion polymer comprising
- a first polymer having a calculated Hansch parameter >2.0, the first polymer comprising, as copolymerized units, 0.5-5 wt. % acid monomer, based on the weight of said first polymer, and
- a second polymer comprising, as copolymerized units, from zero to less than half the wt. % of acid monomer in said first polymer, based on the weight of said second polymer,
- wherein said second polymer is from 50% to 85% of the total weight of said first polymer and said second polymer, and wherein the difference between the calculated Tgs of said first and said second polymer is from 0° C. to less than 20° C.
An aqueous coating composition comprising a multi-stage aqueous emulsion polymer comprising
- a first polymer having a calculated Hansch parameter >2.0, said first polymer comprising, as copolymerized units, 0.5-5 wt. % acid monomer, based on the weight of said first polymer, and
- a second polymer comprising, as copolymerized units, from zero to less than half the wt. % of acid monomer in said first polymer, based on the weight of said second polymer,
- wherein said second polymer is from 50% to 85% of the total weight of said first polymer and said second polymer, and wherein the difference between the calculated Tgs of said first and said second polymer is from 0° C. to less than 20° C.
A method for providing a coating comprising
- (a) forming an aqueous coating composition comprising a multi-stage aqueous emulsion polymer comprising
- a first-stage polymer having a calculated Hansch parameter >2.0, the first polymer comprising, as copolymerized units, 0.5-5 wt. % acid monomer, and
- a second-stage polymer comprising, as copolymerized units, from zero to less than half the amount of acid monomer in said first-stage polymer,
- wherein said second-stage polymer is from 50% to 85% of the total weight of said first-stage polymer and said second-stage polymer, and wherein the difference between the calculated Tgs of said first-stage and said second-stage polymer is from 0° C. to less than 20° C.;
- (b) applying said aqueous coating composition to a substrate;
- and
- (c) drying, or allowing to dry, said applied aqueous coating composition.
Dependencies are inferred from the claim text.